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| Home > Publications database > Untersuchungen zur Behandlung von Schweineflüssigmist in Algengräben |
| Book/Report | FZJ-2018-02659 |
1986
Kernforschungsanlage Jülich, Verlag
Jülich
Please use a persistent id in citations: http://hdl.handle.net/2128/18291
Report No.: Juel-2057
Abstract: Due to the increasing numbers of animals per farm and the density of farms in some areas the amounts of manure produced locally exceed by far the agricultural needs. Overfertilization causes pollution of groundwater (nitrate-enrichment) and surface waters. The use of high-rate-algalponds for the treatment of excess wastes from live-stock production units offers a possibility to reduce environmental damage to a large extend. Data are presented on the influence of copper sulfate used as a growth promoter in pig diets on the growth of microalgae in laboratory cultures. Mathematical models are applied for estimating algal growth. The outcome of outdoor experiments to treat piggery waste with algal-bacterial-systems under the climatic conditions given in Northrhine-Westphalia (Germany) is reported. Special attention is given to the fate of nitrogen, the potential of the photosynthetic oxygenation and the stability of the microalgae population. Prior to treatment in HRAP, solids were separated by sieving and the pig slurry diluted. By adapting retention times and loadings to the mean prevailing global radiation values and temperatures, enough oxygen was produced from April to October to treat appr. 1400 m$^{3}$ (N-conc. 5 kg m$^{3}$) liquid slurry per hectare pond surface (COD-reduction 80 %, BOD-reduction up to 96 %). Total albazod (algae-bacteria-zooplankton-detritus) yield is appr. 30 tons of dry matter, which means that 2400 kg of nitrogen can be recycled as a protein-rich feed.
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